The low-energy electronic excitations in cobalt are studied by a theoretical method that includes many-body effects and a realistic description of the band structure. Angle-resolved photoemission spectra measured on a thick film of hexagonal close-packed Co on Cu(111) agree well with calculated spectral functions. Because of many-body effects no sharp quasiparticle peaks exist for binding energies larger than 2 eV and in this energy region the spectrum is essentially incoherent. The many-body corrections are much stronger in the majority-spin channel and drastically affect the spin polarization of the spectra.
Quenching of majority-channel quasiparticle excitations in cobalt / Monastra, S; Manghi, Franca; Rozzi, Ca; Arcangeli, C; Wetli, E; Neff, Hj; Greber, T; Osterwalder, J.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 88:(2002), pp. 236402-236406. [10.1103/PhysRevLett.88.236402]
Quenching of majority-channel quasiparticle excitations in cobalt
MANGHI, Franca;
2002
Abstract
The low-energy electronic excitations in cobalt are studied by a theoretical method that includes many-body effects and a realistic description of the band structure. Angle-resolved photoemission spectra measured on a thick film of hexagonal close-packed Co on Cu(111) agree well with calculated spectral functions. Because of many-body effects no sharp quasiparticle peaks exist for binding energies larger than 2 eV and in this energy region the spectrum is essentially incoherent. The many-body corrections are much stronger in the majority-spin channel and drastically affect the spin polarization of the spectra.
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